Question

(x+15)-125=5⁷ : 5⁵

720: [ 41-( 2x - 5 )= 2³ .5

2⁷- 3 ( x + 4 ) =23

2015^x . 5³ = 125

 

Answer 1

\(\left(x+15\right)-125=5^7:5^5\)

\(\Rightarrow\left(x+15\right)-125=5^2\)

\(\Rightarrow\left(x+15\right)-125=25\)

\(\Rightarrow x+15=25+125\)

=> x+15=150

=> x=150-15

Vậy x=135.

\(720:\left[41-\left(2x-5\right)\right]=2^3.5\)

=> 720:[41-(2x-5)]=8.5

=> 720:[41-(2x-5)]=40

=> 41-(2x-5)=720:40

=> 41-(2x-5)=18

=> 2x-5=41-18

=> 2x-5=23

=> 2x=23+5

=> 2x=28

=> x=28:2

Vậy x=14.

\(2^7-3.\left(x+4\right)=23\)

=> 128-3.(x+4)=23

=> 3.(x+4)=128-23

=> 3.(x+4)=105

=> x+4=105:3

=> x+4=35

=> x=35-4

Vậy x=31.

\(2015^x.5^3=125\)

=> 2015^x.5³=5³

=> 2015^x=5³:5³

=> 2015^x=1

=> 2015^x=2015⁰

Vậy x=0.